| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to accurately discriminate a speech signal section from a background noise section independently of the background noise level, by detecting the speech signal section of an input signal based on a minimum level from a minimum level operation process and a reference level from a reference level operation process. SOLUTION: A minimum level operation part 4 detects the minimum level of an input signal inputted from an input terminal 1 via an execution value operation part 2 for a predetermined time section, and maintains this minimum level. A reference level operation part 5 obtains a reference level from an effective value of the input signal from an effective value operation part 2 by operation. And, based on the minimum level from a minimum level operation part 4 and the reference level from the reference level operation part 5, it is judged whether the input signal is voiced sound(V) or unvoiced sound(UV) or background noise in the predetermined time section. And, an idVUV parameter, which shows the result of the V/UV judgment showing unvoiced sound or background noise or voiced sound, is outputted. |
